It's actually an 1 1/8 threadless.the fork is a 700c fixie landing gear.i machined the schwinn cups for cartridge bearings.i also cut the dropout to move the tire up.thanks man.cutting a 1" threaded is easy.measure it,spin on an old upper race and use it as a guide to get a straight cut.when you unthread it,it acts like a die and cleans up the threads